Add typed-query-selector/strict for compile-time selector validation

Co-authored-by: fregante <1402241+fregante@users.noreply.github.com>

Author: Copilot

global.d.ts

@@ -1,6 +1,14 @@
 /* eslint-disable @typescript-eslint/consistent-type-definitions -- Module augmentation */
 
+// Enable strict mode for querySelector to ensure selectors are valid
+// eslint-disable-next-line import-x/no-unassigned-import, import-x/no-empty-named-blocks
+import type {} from 'typed-query-selector/strict';
+
 // Broaden types because testing against `"undefined"` is fine for our regexes
-interface RegExp {
-	test(s: string | undefined): boolean;
+declare global {
+	interface RegExp {
+		test(s: string | undefined): boolean;
+	}
 }
+
+export {};

package-lock.json

@@ -54,6 +54,7 @@
 		"strip-indent": "^4.1.1",
 		"svelte": "^5.46.1",
 		"svelte-check": "^4.3.5",
+		"typed-query-selector": "^2.12.0",
 		"typescript": "5.9.3",
 		"vite": "^7.3.1",
 		"vitest": "^4.0.17",